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The most revolutionary idea concerning urbanism is not itself urbanistic, technological, or aesthetic. It is the project of reconstructing the entire environment in accordance with the needs of the power of workers councils, of the antistate dictatorship of the proletariat, of executory dialogue.
Guy Debord, La société du spectacle §179
Urbanism renders alienation tactile.
Guy Debord, Mémoires
Integral art, which has been talked about so much, can only be realized at the level of urbanism. 
Guy Debord, Rapport sur la construction des situations
Urbanism is comparable to the advertising propagated around Coca-Cola—pure spectacular ideology.
Internationale situationniste #6
Urbanism and information are complementary in both capital­ist and 'anti-capitalist' societies; they organize silence.
Internationale situationniste #6